Speed regulator for phonographs



M. NYSTROM AND J. SPRING.

SPEED REGULATOR FOR PHONOGRAPHS.

APPLICATION men sansa. 1921. 4

Patented Nov. 28, 1922.

Uni-rsa sraras amaai and tiri..

MARTXN NYSTROM AND JOi'SEIHY SPRING, OF CHICAGO, ILLNQS, ASSIG-NORS TO THE naU-NswrcK-BALKE-communes corrrenr, or

Tron or DELAWARE'.

cnicas-o, rnrrnors', A coa-Pone- SPEED REGULATOR FOR FHONGRAPHS.

Application. inea september ao, 1921. serial nof 504,450.

To all whom may conocia.' f

Be it known that we, MARTIN Nrsrnon and JosErH SPRING, citizens of the United States, residing at Chicago, in the county of Cook andQStatc of Illinois, have invented certain new and useful Improvements' in Speed Regulators for P honographs, of

which the following is a specification.`

This invention .relates to motors for phonographs and has for its principal object to provide a structure in which the adjustment for controlling the speed ofthe inotgor can be accomplished with a mini-y mum of time and effort. n y

Another object of the invention is to.pro duce a device for controlling the speedwof the motor -which'rcan be adjusted without removing the motor from its support.

Another object of the invention 1s to l place the means for adjusting the speed regl ulating` device within the control of means above the motor boa-rd. n

Other objects will become apparent as the description is. read in connection with the accompanying drawing wherein the selected embodiment of the invention .is` illusto the motor board and carry the motor' frame 11 securedtheretoi by bolts 12 or in any other suitable manner. of such a top plate is notessential to my invention and is illustrated kprincipally to indicate the top covering 'below 'which the speed controlling` devicesare'jusually located and which'has made it necessary heretofore 'to -remove the motor in 4ordertoadjust the speed regulator. lt will be understood that `we do not wish to be limited to this or any other specific-structure described except asis made necessary by the prior art.

13 indicates a spindle adapted to carry the usual record table. rlhis spindle is suit-y ably journaled in bearings which hold it in an upright position and is equipped with a worm 14 meshing with a worm gear 15 on a shaft 16 carrying a pinion 17 meshing The 'presence with a gear 1S which is driven by springs,

-not shown. The spindle 13 is also equipped with: a worm gear 19 meshing with a worm 20'on a governor` shaft 21 which is journaled in suitable bearings 22 carried by the frame. yLoosely mounted on the governor shaftis a sleeve 23 having a'collar 24 at one end and carrying a drum25 at its other end. The web of this drum is provided with suitable 4oerforations for the springs 65, secured at oneend to the collar 24 and at the opposite end to the collar 2G .rigid These springs are with the kshaft 21. equipped with weights 27 which. upon rota- -tion of .the governor shaft, are thrown Outwardly and` cause the drum to move to the `right in F ig. 1 and bear against a brake pad 28, when thespeed of the motor reaches the desired constant. s f

The motor may be allowed a number of different speeds by adjusting this brake pad Y. 28 yat greater orrless distances fromthe normal position the drum 25, when the devices are at rest. To accomplish this we make use of the lever indicatedgenerally at 29 pivoted on a screw 30 threaded intor a socket on the main frame. We prefecto Ina-ke thisl lever out of a single piece of sheetmetal, bent into the desired conformaf tion. .sseen in Fig; 2, we provide it with an arm 31- which weprefer to'bendat 32r` .and 33y so as to locate a portio'nf34 parallel `to thek section and through which the screw 30` is vpassed thereby lforming a very strong. connection. Another arm 3G isbent laterallydfrom the portion35, then downwardly, then intoa. substantially circular conformation `37, then lapped on vitself at ,387,where it is fsecuredvby a screw 39v thusr ,forming an arm having asuitable circular Aboss for the reception of a screw 40by which `the brake vpad 28 is ladj'ustably lmounted. Anotherarm 41 of the lever is vinclined as indicated in the drawing and providedwith a bifurcatedj end 42, one fork of which is bent at right angles tothe arm 41 and provided witha projection43 adapted to run between the threads 44 of an adjusting screw 45 swivelled in a cylinder 46 secured tothe top plate 10. f The other fork is given a reversebend 47 -to locate its end 48 parallel to the arm 41 and' spaced from the fork43 a suitable distance to permit the end i8 to bearairainst the outer surface of the threads 4st. ln order to provide a long bearing on the threads this fork may be equipped with extension 49, see 3.

The upper end ot the screw t5 is equipped with knob 50 or other suitable hand device by which this screw can be rotated and beneath the knob is an indicator' 5l loosely pivoted on the screw d5, supported upon an annular shoulder 54,- on the screw and norally held against movement by the clamping; screw employed to adjustably clamp the indicatordown upon the annular shoulder 5d on the screw. rihe indicator iinger passes over a suitable dial 53 or other surface on which speed indicating` design may be drawn, Y

Heretotore'it has been necessary to place the-motor on a block, set it in motion, connect speedometer to the spindle it?. or the table carried thereby, and thenmalre some adjustment in the. devices carrying1 the brake pad 2S so as to have the drum contact with the pad when the proper speei'l was reached. The motor wasthenplace in the cabinet and the top plate secureo to the motor board or some other suitable part by screws or bolts. This top plate being of relativelythin material and somewhat flexible would almost invariably be slightly distorted in securing it in place in the cabinet. This distortion would result in the change ot the relative position oit.' the lever 29 and the adjusting' devices and consequently the drum would not come in contact with the pad y 28 at the's( me speed as before the top plate was distorted, rihese prior devices were not provided with an adyustable indicator linyger and thereforethe motor would have to be removedand another adJustment niade in an attempt to have the brake applied when the indicatory linger indicated the desired normal speed. j

ith our invention a motor assembled. as indicated in F l ofthe drawing is placed in the cabinet and made `tast in any suitable manner, the speedometer is connected with the table on the spindle 13 and the knob 50 is turned until the motor is giving the desired normal speed. The screw 52 1s then' loosened and the indicating linger Filis Y' moved to register with the point on the dial indicating the normal speed desired and the screw 52 is again setdown. It will thus be seen that this construction enables any person to make the necessary adjustment accurately and quickly and without the use of any special tool.

The constructionl of the lever Q9, as described, makes it possible to manufacture this part in its entirety by machinery from ordinary sheet metal and consequently re sults in a considerable saving.

life are aware that changes in the form and proportion oi parts, and in the details of construction ot our iur ention may be made without departing from the spirit or sacrificing any oif the advantages thereof, and we reserve the right to make all such changes as fairly tall within the scope ot the following claims.

life claim:

l. in a phonograph, a motor, a brake, means tor applyingand releasing the brake including a lever, a rotatable sha'tt adapted to operate saidlever, an indicator rotatably mounted on the sha'tt, a knob iined to the shaft and abovethe indicator, and a set screw passing` dovv'nwardly through said knob and engaging said indicator to secure it inan adjusting,` position.

2. lin a phonograph, the combination or' a top plate, a motor below said top plate, means for controlling' the speed oit said niotor arranged below said top plate, means tor adjusting' said speed controllinaY means in-` cludinp,` a vertical screw extending' through and rotatable in the top plate, a knob on said screw above said top plate, an index rotatably mounted on said screw and above the top plate, and a set screw extending through said knob parallel to the axis ot said screw and locking said index in an adjusted position.

3. ln a speed regulator, the combination of a screw, a lever including` a dat bar arranged edgewise to the length ot the screw, an arm on said lever bent to present an ed ge in engagement with the threads ot the screws, and another arm presenting a l'iat side to the threads opposite to the :first arm. y

d. In a speed regulator, the combination of .a governor including a` brake drum, a brake lever composed oit a fiat metal strip having one arm bent to form spaced bearings, a tulcrum on'which said bearings are 105 mounted, a second arm on said `brake lever carrying,r a pad adapted to engage said drum and adjustable screws for oiierating said lever, and a third arm on said lever arranged edgewise to the length of said screws and having bifurcations for engagement tl1erewith, one bifurcation being bent to present an edge to the threads and the other bii'urcation being arranged `to present a side to the threads opposite 'to the rst bifurcation. 115

MARTIN 'NYSTROM- JOSEPH SPRING. 

